基于分段二次流变模型的泥石流流速垂向分布

Vertical Velocity Distribution in Debris Flow Based on Piecewise Quadratic Rheological Model

泥石流流速垂向分布是泥石流动力学的核心研究内容之一,它关系到泥石流堆积、运移、冲击力、运动摩阻等重要工程设计参数的计算。本文对二次流变模型进行分段处理,建立泥石流流速垂向分布理论计算公式,用17组试验数据对模型进行验证。结果表明:分段流变模型能较好地拟合试验数据;基于试验数据,建立了卡门常数与含沙量之间的关系,给出了流速为0的位置与中值粒径和含沙量的关系。

The vertical distribution of debris flow velocity is one of the core research contents of debris flow dynamics,which is related to the calculation of important engineering design parameters such as debris flow accumulation,migration,impact force and motion friction.The quadratic rheological model was treated in sections,and the theoretical formula of vertical distribution of debris flow velocity was established in this paper.The model was verified by 17 sets of experimental data.The results show that the piecewise rheological model can fit the experimental data well.Based on the experimental data,the relationship between Karman constant and sediment content is established,and the relationship among the position where velocity is zero and the median particle size and sediment content is given.